Read the following text and answer the question on the basis of the same:
DNA, a long polymer of deoxyribonucleotide. Altmann and these substances to be acidic hence he named nucleic acid. The basic unit of DNA is a nucleotide which has three components a nitrogenous base, a pentose sugar (deoxyribose) and a phosphate group. There are two types of nitrogenous bases in DNA, Purine and Pyrimidine. J. Watson and E. Crick proposed a double helix model for the structure of DNA. There are four types of DNA i.e., A, B, C, Z.
Phosphoric acid is found in :

Options

A. Nucleic acids
B. NAD and FAD
C. Phosphoprotein
D. All of these.

Explanation

To answer the question regarding where phosphoric acid is found based on the provided text, we can break down the solution into several steps:

### Step-by-Step Solution:

1. **Understanding DNA Structure**:
- DNA is described as a long polymer of deoxyribonucleotides. Each nucleotide consists of three components: a nitrogenous base, a pentose sugar (deoxyribose), and a phosphate group.

2. **Identifying Components**:
- The text mentions that the basic unit of DNA is a nucleotide, which includes the phosphate group. This indicates that phosphoric acid is part of the nucleotide structure.

3. **Role of Phosphoric Acid**:
- Phosphoric acid (H₃PO₄) is crucial in the formation of nucleic acids. It provides the phosphate group that links the nucleotides together, forming the backbone of the DNA strand.

4. **Types of Nitrogenous Bases**:
- The text states there are two types of nitrogenous bases: purine and pyrimidine. While this is relevant to the structure of DNA, it does not directly answer where phosphoric acid is found.

5. **Conclusion**:
- Since phosphoric acid is a component of nucleotides and is essential for the structure of DNA, it can be concluded that phosphoric acid is found in nucleic acids (DNA).

### Final Answer:
Phosphoric acid is found in nucleic acids, specifically as part of the nucleotide structure in DNA.

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